I am experiencing an intermittent problem where a blank page is returned after an event triggers an ajax submit, for example when I check a checkbox that is defined with
<a4j:support event="onclick" action="#{...}" reRender="code" requestDelay="1000" eventsQueue="eventq" ignoreDupResponses="true"/>
you need to show more code here. The raw ideas - Ajax and non-Ajax request at the same time and server side exception during the Ajax request that followed with non-Ajax response.